:root{--container: 1200px;--section-padding: clamp(3rem, 6vw, 6rem);--card-radius: 26px}section{width:100%;padding:var(--section-padding) 5%}.section-header{max-width:var(--container);margin:0 auto 3rem;text-align:center}.section-header h2{font-size:clamp(1.9rem,3vw,2.6rem);font-weight:800;margin-bottom:.6rem}.section-header p{color:var(--text-light);font-size:1.05rem}.hero-slider{position:relative;overflow:hidden;padding:5rem 5% 6rem;background:linear-gradient(135deg,#fdfbfd,#f4ecf7)}.hero-slide{max-width:var(--container);margin:auto;text-align:center;display:none;animation:fadeInUp 1s ease}.hero-slide.active{display:block}.hero-slide h1,.hero-slide h2{font-size:clamp(2.4rem,5vw,4rem);font-weight:800;line-height:1.1;background:linear-gradient(to right,#2c3e50,var(--primary),#e74c3c);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.hero-slide p{max-width:720px;margin:1rem auto 2rem;font-size:1.15rem;color:var(--text-light)}.hero-actions{display:flex;justify-content:center;gap:1rem;flex-wrap:wrap}.hero-dots{margin-top:2rem;display:flex;justify-content:center;gap:10px}.hero-dots .dot{width:10px;height:10px;background:#ccc;border-radius:50%;cursor:pointer}.hero-dots .dot.active{background:var(--primary)}.classes-section{background:linear-gradient(to bottom,#fdfbfd,#f4ecf7)}.class-grid{max-width:var(--container);margin:auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:2.2rem}.class-card{display:flex;flex-direction:column;justify-content:space-between;height:100%;min-height:320px}.class-card h3{margin-bottom:.6rem}.class-card p{flex-grow:1}.card-action{margin-top:auto;font-weight:600;color:var(--primary)}.class-card:hover{transform:translateY(-10px);box-shadow:0 25px 55px #8e44ad2e}.feature-grid{max-width:var(--container);margin:auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:2.5rem}body.dark-mode{background:#0b0b10}body.dark-mode section{background:transparent}body.dark-mode .class-card,body.dark-mode .feature-card{background:#1e293b;color:#f1f5f9;border:1px solid rgba(255,255,255,.05);box-shadow:0 10px 30px #00000080}body.dark-mode .floating-back-btn{background:#2c3e50;color:#fff;box-shadow:0 4px 15px #0009}body.dark-mode .floating-back-btn:hover{background:#34495e;color:var(--primary)}.dark-toggle{position:fixed;bottom:28px;left:28px;width:52px;height:52px;border-radius:50%;background:linear-gradient(135deg,#8e44ad,#c0392b);color:#fff;border:none;box-shadow:0 12px 35px #8e44ad80;cursor:pointer;z-index:2000;display:flex;align-items:center;justify-content:center;font-size:1.2rem;transition:.3s}.dark-toggle:hover{transform:scale(1.08) rotate(8deg)}.floating-back-btn{position:fixed;bottom:20px;left:80px;width:50px;height:50px;border-radius:50%;background:#fff;color:#2c3e50;box-shadow:0 4px 15px #0000004d;z-index:1999;display:flex;align-items:center;justify-content:center;font-size:1.2rem;transition:all .3s ease;text-decoration:none}.floating-back-btn:hover{transform:translateY(-3px);box-shadow:0 6px 20px #0006;color:var(--primary)}footer{background:#0f0f0f;color:#ecf0f1;padding:5rem 5% 2rem;position:relative;overflow:hidden}.footer-grid{max-width:var(--container);margin:auto;display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:3rem;padding-bottom:3rem;border-bottom:1px solid #333}.footer-col h3,.footer-brand h2{color:#fff;margin-bottom:1.2rem}.footer-col a,.footer-brand p{color:#bbb;font-size:.95rem;line-height:1.6}.footer-col a:hover{color:var(--primary);padding-left:6px}.social-links{display:flex;gap:1rem}.social-links a{width:40px;height:40px;border-radius:50%;background:#222;display:flex;align-items:center;justify-content:center;color:#fff;transition:.3s}.social-links a:hover{background:var(--primary);transform:translateY(-3px)}.copyright{max-width:var(--container);margin:2rem auto 0;display:flex;justify-content:space-between;flex-wrap:wrap;color:#777;font-size:.85rem;gap:1rem}.back-to-top{position:fixed;bottom:28px;right:28px;width:52px;height:52px;background:var(--primary);color:#fff;border:none;border-radius:50%;box-shadow:0 10px 30px #0000004d;cursor:pointer;opacity:0;visibility:hidden;transform:translateY(20px);transition:all .3s ease;z-index:1500}.back-to-top.show{opacity:1;visibility:visible;transform:translateY(0)}.back-to-top:hover{background:var(--primary-dark);transform:translateY(-5px)}body.dark-mode header,body.dark-mode nav{background:#14141ef2}body.dark-mode .hero-slider,body.dark-mode .carousel-section{background:#0f0f1a}body.dark-mode footer{background:#06060a}body.dark-mode .section-header h2{color:#f5f5f5}body.dark-mode .section-header p{color:#aaa}body.dark-mode .back-to-top{background:#7b2cbf}@media(max-width:992px){.footer-grid{grid-template-columns:1fr 1fr}}@media(max-width:600px){.hero-slide h1{font-size:2.2rem}.hero-slide p{font-size:1rem}.footer-grid{grid-template-columns:1fr;text-align:center}.footer-col{text-align:center}.footer-col .logo,.social-links{justify-content:center}.copyright{flex-direction:column;text-align:center}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}.animate-on-scroll{opacity:0;transform:translateY(40px);transition:opacity .8s cubic-bezier(.22,1,.36,1),transform .8s cubic-bezier(.22,1,.36,1)}.animate-on-scroll.is-visible{opacity:1;transform:translateY(0)}